露天矿边坡爆破振动破坏判据新方法及其应用
来源期刊：中南大学学报(自然科学版)2000年第6期
论文作者：宋光明 史秀志 陈寿如
文章页码：485 - 488
关键词：动态应力比;爆破振动;破坏判据
Key words：dynamic stress ratio; blasting vibration; damage criterion
摘 要：爆破振动危害动态应力比评价方法是根 据爆破振动实地监测及质点振速预测方程 ,结合现场损伤破坏调查而求得岩土结构爆破振动破坏判据的一种新方法 .该法综合爆破振动水平、岩体特征、现场条件及岩土支护系统等因素 ,可以较全面地反映岩土结构受爆破振动时的动态应力状态和损伤破坏程度 .通过几个露天矿采场边坡的动态应力比评价 ,得出 :要保证露天矿边坡这种经常遭受爆破振动作用的整体性设施的安全 ,其动态应力比DSR临界值应小于 0 .0 6 0± 0 .0 0 8;要得到动态应力比判据 ,首先应当在现场监测爆破振动质点振速 ,调查、记录测点范围的岩土损伤情况 ,求得振动衰减方程 ,最后根据监测数据和现场参数求得DSR值的对应关系 ,以DSR临界值作为边坡爆破振动破坏的最终标准 .
Abstract: According to monitoring of blasting vibration, the forecasting equations of particle vibration velocity and the investigation on slope in situ, the method based on dynamic stress ratio ( DSR ) for evaluating blasting vibration damage is a new way to get the criterion of rock and soil structure damaged and destroyed. The method concerns many factors, including the blasting vibration level, the character of rock mass, the conditions in situ and rock soil timbering system. It can be used to reflect roundly the dynamic stress states and damage of rock soil structure induced by blasting vibration. Using this method for evaluating the damage on some open pit slope in Anhui and Hubei provinces, the authors present a new blasting damage criteria for the open pit slope often affected by the blasting vibration, and the critical value of DSR must be less than 0.060±0.008. To gain the dynamic stress ratio criteria, workers must monitor the particle velocity of blasting vibration in situ first. At the same time, the conditions of rock and soil mass damaged and destroyed must be investigated and noted in the scope of surveying points. Then, the attenuating vibration equation and the value of DSR are derived from the monitoring data and some parameters. At last, based on the one to one correspondence relation between the value of DSR and the classification of the conditions of rock and soil damaged and destroyed, the critical value of DSR is the final criterion of damage and destroy induced by blasting vibration.
